@keyframes move{

    100%{
        transform: rotateZ(360deg)
    }
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
ul{
    list-style: none;
}
a{
    text-decoration: none;
    
}
img{
    vertical-align: middle;
}
.w{
    width: 1150px;
    margin: auto;
}
header{
    width: 100%;
    height: 80px;
    /* overflow: hidden; */
    /* background-color: #fff; */
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1;
    transition: all .3s ease-out;
}
.logo{
    float: left;
    width: 350px;
    height: 80px;
    background: url(../images/logo_sprites-d6d0b2f7.png) no-repeat;
    background-size: 350px auto;
    background-position: 0 -48px;
}

.nav{
    float: right;
}
.nav>li {
    position: relative;
    float: left;
    font-size: 18px;

}
.nav>li a:hover {
    color:#4a4a4a;
}

.nav li a{
    display: block;
    position: relative;
    padding: 0 15px;
    line-height: 80px;
    color: #fff;
    overflow: hidden;
   
}

.nav>li a::before{
    position: absolute;
    content: '';
    width: 100%;
    height: 100%;
    left: 0;
    bottom: -80px;
    background-color:rgb(250, 250, 250);
    z-index: -9;
}

.nav a:hover::before{
    bottom: 0px;
    transition:all .3s ;
}
.joinUs{
    width: 220px;
    display: none;
    position: absolute;
    z-index: 3;
    text-align: center;
    background-color: rgb(250, 250, 250);
    left:0;
    top: 80px;
    cursor: pointer;
}
.joinUs li{
    padding: 0 15px;
    height: 35px;
    font-size: 16px;
    line-height: 35px;
}
.joinUs li {
    color: #9b9b9b
}
.joinUs li:hover {
    
    background-color: #ccc;
}
/* 头部结束 */
.tech{
    display: flex;
    padding-top: 200px;
    justify-content: space-around;
    margin: 0 auto;
    height: 600px;
    background:#0e086e url(../images/about_banner-549292ea.png) no-repeat;
}
.tech>ul>li{
    float: left;
    position: relative;
    overflow: hidden;
    margin-right: 10px;
    width: 240px;
    height: 200px;
    border-radius: 8px;
    background-color:rgba(50,60,122,.8);
    text-align: center;
}
.tech li img{
    width: 100%;
}
.tech li p {
    color: #fff;
    font-size: 18px;
    font-weight: bold;
    margin-top: 10px;
}
.tech .txt{
    display: none;
    /* position: absolute;
    top: 0;
    left: 0; */
    width: 240px;
    height: 200px;
    border: 2px solid #fff;
    border-radius: 8px;
    background-color: #1f78ed;
    text-align: center;
    padding: 10px 0 10px 40px;
    background: url(../images/悬停背景-b7950136.png) no-repeat;

}
.content {
    position: absolute;
    height: 200px;
    bottom: -150px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 22px;
    color: #fff;
}
.content img {
    width: 250px;
    height: 60px;
}
.tech ol li {
    color: #fff;
    margin-top: 5px;
    cursor: pointer;
}

/* 底部开始 */
footer{
    position: relative;
    background:#1f2532 url(../images/footer_bg-6decca7b.png)bottom no-repeat;
    padding: 50px 0;
    height: 250px;
    color: #9b9b9b;
}
footer dl{
    float: left;
}
footer dl dt {
    margin-bottom: 20px;
    font-size: 20px;
    color: #fff;
}
footer dl dd {
    margin-bottom: 10px;
}
footer .two{
    margin: 0 80px;
}
.erweima{
    width: 105px;
    height: 105px;
    float: right;
    text-align: center;
}
.erweima img {
    width: 100%;
    margin-bottom: 10px;
}
.return{
    /* display: none; */
    position: fixed;
    right: 120px;
    bottom: 100px;
    width: 44px;
    height: 44px;
    border-radius: 5px;
    background: url(../images/to_top-cf23b656.png) 6px 4px no-repeat;
    background-color: #9b9b9b;
}
.copy {
    padding: 25px 0;
    background-color: #171c23;
    font-size: 14px;
    color: #4a4a4a;
    text-align: center;
}
.copy a {
    margin: 0 10px;
    color: #4a4a4a;
}
.copy p {
    margin-top: 10px;
}
